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f1dbe439a1
As the standard LDAP groups (groupOfNames) require at least one "member"
value to be present in a group, we have workarounds in place that add an
empty member ("") when creating a new group or when removing the last
member from the group. This can cause a race condition when e.g. multiple
request to remove members from a group an running in parallel, as we need
to read the group before we can construct the modification request. If
some other request modified the group (e.g. deleted the 2nd last member)
after we read it, we create non-working modification request.
These changes try to catch those errors and retry the modification
request once.
Fixes: #6170